1881689472 has 384 divisors, whose sum is σ = 6515964000. Its totient is φ = 514916352.

The previous prime is 1881689461. The next prime is 1881689477. The reversal of 1881689472 is 2749861881.

1881689472 is a `hidden beast` number, since 1 + 8 + 8 + 168 + 9 + 472 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881689477) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4837054 + ... + 4837442.

Almost surely, 2^1881689472 is an apocalyptic number.

1881689472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1881689472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3257982000).

1881689472 is an abundant number, since it is smaller than the sum of its proper divisors (4634274528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1881689472 is a wasteful number, since it uses less digits than its factorization.

1881689472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 443 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 1881689472 is about 43378.4447854000. Note that the first 3 decimals coincide. The cubic root of 1881689472 is about 1234.5707550095.

The spelling of 1881689472 in words is "one billion, eight hundred eighty-one million, six hundred eighty-nine thousand, four hundred seventy-two".